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Old 6th January 2012, 03:03 AM   #11
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Quote:
Originally Posted by Perry Babin View Post
Post the voltage on all pins of U304 and pins 5, 6 and 7 of U306. Set the subsonic switch on. That should help prevent it from going into protect.

Pin 1: 2.171
Pin 2: 0.200
Pin 3: 5.45
Pin 4: 6.09
Pin 5: -4.59
Pin 6: 0.070
Pin 7: -4.35
Pin 8: -5.96

Pin 5: - 4.35
Pin 6: - 1.613
Pin 7: - 1.678
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Old 6th January 2012, 03:09 AM   #12
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Pin 8 doesn't have +6v.
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Old 6th January 2012, 03:14 AM   #13
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Not sure if you are telling me or asking me but I just double checked and my meter says -5.96 vdc 100% sure about this.

Is it suppose to be +6v?

If so does this mean the op-amp is defective or something else is causing this?
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Old 6th January 2012, 03:19 AM   #14
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It should have +6v on pin 8.

Do you need the schematic diagrams?
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Old 6th January 2012, 03:24 AM   #15
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Yes I do.

Although I may still need your help.

It kinda reminds me of a BD1500 with the bad op-amp you helped me fix along time ago. I am not sure but the wierd stuff the amp is doing with the pulsing and chirping and popping noises through the speaker.

Wierd thing is it has noises coming from the power supply side and the output side. The internal frequency or chirping sound coming from the output side is transfered to the speaker when its hooked up.

So how could the output switch from positive to negative? Could the op-amp be defective in a way that could cause this?
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Old 6th January 2012, 03:29 AM   #16
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I think the positive regulator simply failed and without a positive supply, things were pulled down towards the -6v.

Check your email.
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Old 6th January 2012, 03:31 AM   #17
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Thanks for the schematics I will change out U304 and see what I have.
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Old 6th January 2012, 03:54 AM   #18
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I changed out U304 and still same result.

U306 also has the -5.96 on pin 8

I am not sure where to go next guess I will keep looking over the schematic.
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Old 6th January 2012, 04:10 AM   #19
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What effect could R349 and R350 have if they are out of tolerance?

They dont check out good in the circuit, probably have to remove them to get a good test result.
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Old 6th January 2012, 04:46 AM   #20
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U304 isn't the +V regulator. Perry stated the regulator failed not the opamp.

Sent from my Punch 60.2
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